Quartz-mill



(No Model.)

- H. GRAIN & J. W. FORBES.

QUARTZ MILL.

No. 600,635. Patented Mar. 15.1898.

surfaces.

Nirn STATES ATENT OFFICE.

HUGH H. GRAIN AND JOHN W. FORBES, OF PLYMOUTH, CALIFORNIA.

QUARTZ-M LL.

SPECIFICATION forming part of Letters Patent No. 600,635, dated March 15, 1898. Application filed April 23, 1897. Serial No. 633,497. (No model.)

T0 at whom it may concern:

Be it known that we, HUGH H. GRAIN and JOHN W. FORBES, citizens of the United States, residing at Plymouth, county of Amador, State of California, have invented an Improvement in Quartz-Mills; and we hereby declare the following to be a full, clear, and exact description of the same.

Our invention relates to a mill which is especially designed for crushing quartz and other material; and it consists of the parts and the constructions and combinations of parts hereinafter described and claimed.

The figure represents a side view of our mill, showing the bottom in section.

In the present case we have shown a mortar A of any suitable or convenient size and shape. The fioor of this mortar is preferably in the form of a parallelogram of sufficient length to allow the crushing-weights to swing freely in the direction of its length and of sufficient width to receive two or more weights. The bottom of the mortar is provided with channeled or corrugated dies B, which serve to receive the strain and wear of crushing and protect the bottom of the mortar. These dies are fixed in any suitable manner and may be removed andrenewed as fastas they are worn out.

The crushing devices consist of heavy weights or blocks 0, which have shoes D, fixed upon their lower surfaces in any suitable or convenient manner, these shoes being separated from each other to form channels or corrugations corresponding with those in the dies at the bottom of the mortar.

Above the mortar are the shafts or supports E, extending transversely across and adapted to receive the rods, chains, or other suspending devices F, which are suitably secured to the shafts and extend down to the ends of the swinging weights, where they are fixed to convenient projections or other fastenings, as shown at G. These suspending devices may" preferably be in the form of rods having one or more loose links interposed, so as to allowof an independent movement of the crushing-weights when they strike the material beneath; and the suspending devices are independently adjustable to compensate for the wear of the grinding- These weights have connectingrods or pitmen H properly linked or jour- The ore having been fed into the mortar the apparatus is set in motion and the weights swinging about their points of sup: port will have a plunging motion, approaching as closely as possible to the bottom of the mortar, so that any rock between the shoes and the bottom of the weights and the dies in the mortar will be subjected to the com bined crushing action caused by the weight plunging upon it and also to a grinding action as theweight moves across the lowest part of its arc and commences to rise upon the opposite side.

The corrugations and channels in the shoes and dies serve to hold the rock and prevent its sliding along when the weights strike it.

The rock may be fed into the mortar in any suitable or desired sizes within the capacity of the weights to act upon it, and when the apparatus is set in motion it rapidly reduces ciently reduced, and the crushing is thus made I continuous and rapid.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In an apparatus for crushing ores, am0r-- supplemental links interposed in the length of the first-named links to permit of an independent movement of each end of the weight and means whereby the suspending devices may be independently adjusted to compensate for the wear of the grinding-surfaces.

In witness whereof we have hereunto set our hands.

HUGH H. GRAIN. J W. FORBES.

WVitnesses:

CHAS. W. BALL, LoUIs JONES. 

